ISO 8644:2006

INTERNATIONAL ISO
STANDARD 8644
Second edition
2006-11-01
Motorcycles — Light-alloy wheels —
Test method
Motocycles — Roues en alliages légers — Méthodes d'essai

Reference number
©
ISO 2006
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ii © ISO 2006 – All rights reserved

Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 1
4 Test. 2
5 Rotational bending fatigue test . 2
5.1 Test equipment . 2
5.2 Test conditions . 3
5.3 Test procedure . 3
6 Radial load durability test . 3
6.1 Test equipment . 3
6.2 Test conditions . 4
6.3 Test procedure . 5
7 Radial impact resistance test . 5
7.1 Test equipment . 5
7.2 Test conditions . 7
7.3 Test procedure . 8
8 Torsional fatigue test. 8
8.1 Test equipment . 8
8.2 Test conditions . 8
8.3 Test procedure . 9
9 Air leak test. 10
9.1 Test equipment . 10
9.2 Test conditions . 10
9.3 Test procedure . 10
10 Performance . 11
10.1 Durability against bending moment. 11
10.2 Durability against radial load. 11
10.3 Impact resistance. 11
10.4 Durability against torsional moment . 11
10.5 Airtightness of rims. 11

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 8644 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 22,
Motorcycles.
This second edition cancels and replaces the first edition (ISO 8644:1988), which has been technically revised.
iv © ISO 2006 – All rights reserved

Introduction
It is recognized that there are three types of somewhat different equipment for radial impact testing.
Application of any of the types of test equipment is effective in this International Standard.
INTERNATIONAL STANDARD ISO 8644:2006(E)

Motorcycles — Light-alloy wheels — Test method
1 Scope
This International Standard specifies methods for determining the performance of light-alloy road wheels for
motorcycles under normal road use.
This International Standard is applicable to wheels for motorcycles with two or three wheels (including
motorcycles equipped with side-cars) as defined in ISO 3833, of the following types:
⎯ unit construction light-alloy wheels; and
⎯ composite construction light-alloy wheels.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 3833, Road vehicles — Types — Terms and definitions
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
unit construction light-alloy wheel
wheel of which rim and spokes, or disc, are manufactured as a single unit
3.2
composite construction light-alloy wheel
wheel of which rim is made of light alloy, and of which support structure of light alloy or other metals is then
assembled
3.3
single mass impact test equipment
impact test equipment in which a single striker can be dropped freely
3.4
pendulum impact test equipment
pendulum impact test equipment in which striker can be swung freely
3.5
double mass impact test equipment
impact test equipment in which both main and auxiliary striker weights are joined together with coil springs
and can be dropped freely to give a combined force
4 Test
The tests to be carried out shall be the following:
a) rotational bending fatigue test (see Clause 5);
b) radial load durability test (see Clause 6);
c) radial impact resistance test (see Clause 7);
d) torsional fatigue test (see Clause 8);
e) air leak test (applicable only to wheels designed and marked for use with tubeless tyres; see Clause 9).
A different wheel may be used for each test.
5 Rotational bending fatigue test
5.1 Test equipment
The test equipment shall be planned to produce a constant bending moment on the centre of the light-alloy
wheel which rotates at a constant velocity. An example of such equipment is shown in Figure 1.

Key
1 rotary disc
2 fastening
3 light-alloy wheel
4 loading arm
5 pivot point
...